Ghost pirates, hidden treasure, and a mystery on the Thames...

When the Thames and Tide Club discover an old cutlass by the River Thames, and it suddenly vanishes along with Mrs Drummonds, they know something is up!

Their search leads to treacherous seas, ghostly pirates, tricky riddles, and a race to recover long-lost treasure. Can they solve the mystery and save the day?

The third hilarious, and thrilling adventure in the acclaimed series by award-winning author Katya Balen.